Cl[CH:2]1[C:7]2[CH:8]=[C:9]([C:12]#[N:13])[CH:10]=[CH:11][C:6]=2[O:5][C:4]([CH3:15])([CH3:14])[CH2:3]1.[N-:16]=[N+:17]=[N-:18].[Na+].O>CN(C)C=O>[N:16]([CH:2]1[C:7]2[CH:8]=[C:9]([C:12]#[N:13])[CH:10]=[CH:11][C:6]=2[O:5][C:4]([CH3:15])([CH3:14])[CH2:3]1)=[N+:17]=[N-:18]A mixture of 4-chloro-6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran(3g) and sodium azide (0.9g) in N,N-dimethylformamide (20 ml) was stirred for 3 days at room temperature. Water was added and the mixture extracted with ethyl acetate, the organic phase was separated and further washed with water, then dried over anhydrous sodium sulphate. Filtration and evaporation of the solvent in vacuo gave the title compound (3.03g) as a solid, which was used in the next step without further purification.
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